 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.jface.viewers.ISelectionProvider;
 import org.eclipse.ui.IWorkbenchPart;

 /**
  * This class adds to the PluginAction support by
  * setting itself up for work within a WorkbenchPart.
  * The main difference is that it is capable of
  * processing local selection changes within a part.
  */
 public class PartPluginAction extends PluginAction {
     /**
      * PartPluginAction constructor.
      */
     public PartPluginAction(IConfigurationElement actionElement, String id,
             int style) {
         super(actionElement, id, style);
     }

     /**
      * Registers this action as a listener of the workbench part.
      */
     protected void registerSelectionListener(IWorkbenchPart aPart) {
         ISelectionProvider selectionProvider = aPart.getSite()
                 .getSelectionProvider();
         if (selectionProvider != null) {
             selectionProvider.addSelectionChangedListener(this);
             selectionChanged(selectionProvider.getSelection());
         }
     }

     /**
      * Unregisters this action as a listener of the workbench part.
      */
     protected void unregisterSelectionListener(IWorkbenchPart aPart) {
         ISelectionProvider selectionProvider = aPart.getSite()
                 .getSelectionProvider();
         if (selectionProvider != null) {
             selectionProvider.removeSelectionChangedListener(this);
         }
     }
 }

